Definition: In this task, you are given an input list A. You need to convert all the alphabets in the list with a number representing their position in the English alphabet. E.g., replace A by 1, B by 2, a by 1, b by 2, and so on.
Input: ['7103', 'O', 'p', 'I', 'W', '2481']

7103, 15, 16, 9, 23, 2481